Unfortunately I have feeling we won't get rid of this guy that easily. Somehow he'll bribe/blackmail somebody or destroy evidence to worm his way out of these charges. Besides the victims themselves, I feel bad for his dad. Apparently he was actually a nice and decent guy from what the MC said I think, unfortunately you can't always control what you spawn.
Ok, he really get what he deserves here. So, his next move will still be pursuing our MC here? Considering his ego, maybe. And his father is a good man, though having such son is a downfall for him here.
I mean it wasn't disproved that his actions were the reason the sickness was stopped(we know why it was). He probably will be let off because it was stopped before it got to a massive population center but told not to do such harsh actions again or removed from his position.